Right- so is that the reason? He died before he could get to them/ complete them? (and if so, is there a source for that's the reason why we don't have them?)
– alichtJan 29 at 15:22

If I recall correctly, in one of the Masechtot, Rashba"m (who I think was Rashi's grandson?) comments something like, "Don't pay attention to what Rash"i said on such a page. He was senile when he wrote that..."
– DanFJan 29 at 21:11